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from __future__ import annotations

from datetime import datetime

from pydantic import BaseModel

from airflow.utils.state import TaskInstanceState


class LightGridTaskInstanceSummary(BaseModel):
    """Task Instance Summary model for the Grid UI."""

    task_id: str
    state: TaskInstanceState | None
    child_states: dict[TaskInstanceState | None, int] | None
    min_start_date: datetime | None
    max_end_date: datetime | None


class GridTISummaries(BaseModel):
    """DAG Run model for the Grid UI."""

    run_id: str
    dag_id: str
    task_instances: list[LightGridTaskInstanceSummary]
